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400-ATJN — Storage Datasheet

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Dell · DRIVE SFF
WHAT YOU NEED TO KNOW
SAS backplane accepts SATA drives (not vice versa) Buy with tray when possible — saves cost vs separate tray
ALWAYS ASK: "Does it come with tray/caddy?"
PRODUCT OVERVIEW

Increase the storage capacity of your system with the 1.2TB Hard Drive from Dell. Offering a rotational speed of 10000 RPM, this drive provides fast disk access. The unit ships in a SFF form factor suitable for standard rack-mount installations.

Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
SFF BAY→ 400-ATJN
SPECIFICATIONS
Part Number400-ATJN
ManufacturerDell
Form FactorSFF
Capacity1.2TB
COMPONENT DIAGRAM
LATCH 1.2TB SAS — 400-ATJN SAS CONN WITH TRAY — HOT-PLUG READY Tray: See server gen 1.2TB SAS — 400-ATJN BARE DRIVE — NO LATCH Needs caddy/tray to install 2.5" (70 x 100mm) SFF 2.5" DRIVE | 1.2TB | SAS — Always ask: "Does it come with tray/caddy?" | Tray PN varies by server generation TITLE SFF 2.5" DRIVE PN 400-ATJN CAP 1.2TB SAS
KEY FEATURES
•
SFF Form Factor
•
1.2TB Capacity
TYPICAL APPLICATIONS
  • Enterprise storage arrays and SANs
  • Direct-attached storage (DAS) expansion
  • Database tier storage (OLTP, OLAP)
  • Virtual machine datastore expansion
  • Backup-to-disk and disaster recovery targets
  • Content delivery and media streaming storage
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
400-BFWYCompatible
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - SPN - Gen 14
compatible
401-ABHMCompatible
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - DPN - Gen 14
compatible
K41G1Compatible
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - MPN - Gen 14
compatible
W1DGHCompatible
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - MPN - Gen 14
compatible
YMVPPCompatible
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - MPN - Gen 14
compatible
01M0DCompatible
Dell 1.2Tb SAS 12G 10K SFF 512n HDD - APN
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 6
K41G1SUBSTITUTE
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - DPN - Gen 14
DELL
W1DGHSUBSTITUTE
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - DPN - Gen 14
DELL
YMVPPSUBSTITUTE
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - DPN - Gen 14
DELL
400-ATJMSUBSTITUTE
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - DPN - Gen 14
DELL
400-BFWYSUBSTITUTE
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - DPN - Gen 14
DELL
401-ABHMSUBSTITUTE
Dell 1.2Tb SAS 12G 10K SFF 512n HDD in LFF R/T-Series Tray - DPN - Gen 14
DELL
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FREQUENTLY ASKED QUESTIONS
What is 400-ATJN?
400-ATJN is a DELL 400-ATJN internal hard drive 1.2 TB 10000 RPM 2.5" SAS manufactured by Dell.
What parts can replace 400-ATJN?
There are 12 known substitutes for 400-ATJN: 400-BFWY, 401-ABHM, K41G1 and 9 more. Substitute compatibility should be verified for your specific system.
Is 400-ATJN still available?
400-ATJN is currently Unknown.
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Last verified: September 2026